Numbness of the arm often: first of all, consider the cervical spondylosis, cervical spondylosis refers to the cervical disc protrusion, resulting in nerve root compression, the patient can appear arm numbness, and in severe cases, bilateral arm numbness will occur. The numbness of the arms caused by cervical spondylosis will be aggravated after sleeping at night and alleviated after waking up in the morning. Orthopaedic examination will find that the test of pressure on the neck is positive, and if necessary, the CT of the cervical spine can be examined or the magnetic resonance test can be carried out. Treatment can consider traction, acupuncture, massage, physiotherapy and other symptomatic treatment. Secondly, if the arm is often numb, it is also considered to be transient ischemic attack. Transient ischemic attack belongs to ischemic cerebrovascular disease. The patient has atherosclerosis, when the blood vessels are narrowed or blood supply is insufficient, the patient can have transient neurological deficit symptoms. For transient ischemic attacks lasting less than an hour, and the symptoms are relatively fixed, mostly numbness of one side of the limbs, rarely double upper limb numbness, you can check the intracranial vascular ultrasound. Treatment can be given double anti-platelet aggregation, improve circulation and other treatments.